I have a 91/2 year old golden retriever bitch who had two lumps removed in Octobr 2010.  One top middle of her back and one in a mammary gland.  The one on the back appeared first and then the mammry one. The histology came back as tubular-solid carcinomas with squamous diifererention both mammary and haired skin. A possibility that the skin might be a metastic lesion of the mammary lesion (strange that I found the skin one some time before the mammary one).There was concern of further metastic lesions.
This morning I found another small mammary lump at the back end of the bitch and a soft lump on the side of the opposite side but at the front end of the bitch.
The bitch has been on delvosteron for 3 years now is is otherwise very fit (working bitch).  I bred the bitch and there is no history of cancer in line.
My first thought is that if the bitch is to survive, Ishe will need a full mammary strip plus lymph nodes.  What is your opinion.

That is really for a veterinary Cancer specialist, but I would guess so.

Certainly think using the Delvesteron may be increasing the Cancer risk.